I noticed a huge shift in rankings yesterday too. All my sites increased to better rankings, old sites and newly created ones so I don't know if age had much to do with it. Mozcast also shows huge activity in the serps http://www.mozcast.com

I don't think domain age is the only factor for those sites ranking above you, they might be high in authority and their backlinks profile may high compared to you. Did you compared all other factors??

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